Will activating Cloudflare stop all spammers or attackers?

The Cloudflare system should make a significant reduction in spam comments and other threats you see on your website or blog through Basic Security and the Web Application Firewall. We won't catch all spammers or attackers, unfortunately, but the good news is that the system gets smarter the more the community flags specific behavior. In addition, site owners do have the option of blocking IPs or IP ranges in their Cloudflare Traffic Control panel.